<a href="javascript:;" id="sendToTel" >发送短信</a>

<script type="text/javascript">

        $(document).ready(function () {

            $("#sendToTel").click(function () {

                var mobile = $("#txtMobile").val();

                $.ajax({

                    type: "POST",

                    url: "/Ajax/SmsAddress.ashx",

                    data: "Mobile=" + mobile + "",

                    dataType: "text",

                    success: function (msg) {

                            $("#sendToTel").html("<i>发送成功</i>");

                            //在这里禁用30秒  然后才可以重新点

                    }

                });

            });

            var canSend;

            function updateTime(time) {

                var linkBtn = $("#sendToTel");

                linkBtn.html(time <= 0 ? "<i>发送短信</i>" : ("<i>" + time + "秒后可重新发送</i>"));

                var hander = setInterval(function () {

                    if (time <= 0) {

                        canSend = false;

                        clearInterval(hander);

                        linkBtn.html("<i>发送短信</i>");

                        linkBtn.removeAttr("disabled");

                    }

                    else {

                        canSend = true;

                        linkBtn.attr({ "disabled": "disabled" });

                        linkBtn.html("<i>" + time + "秒后可重新发送</i>");

                    }

                }, 1000);

            }

        });

    </script>